MR. FREDERIC GRANNIS MD
NPI 1598773582
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Duarte, CA

NPI Status: Active since August 04, 2006

Contact Information

1500 E DUARTE RD
DUARTE, CA
ZIP 91010
Phone: (626) 359-8111

NPI Profile Information
Primary Taxonomy
Secondary Taxonomies
Insurance Plans Accepted
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Thoracic Surgery (Cardiothoracic Vascula...

About FREDERIC GRANNIS

This page provides the complete NPI Profile along with additional information for Frederic Grannis, a provider established in Duarte, California with a medical specialization in Thoracic Surgery (cardiothoracic Vascular Surgery). The healthcare provider is registered in the NPI registry with number 1598773582 assigned on August 2006. The practitioner's primary taxonomy code is 208G00000X with license number G36693 (CA). The provider is registered as an individual and his NPI record was last updated 11 years ago.

NPI: 1598773582
Provider Name: MR. FREDERIC GRANNIS MD
Gender: Male
Entity Type: Individual
Location Address: 1500 E DUARTE RD DUARTE, CA 91010
Location Phone: (626) 359-8111
Mailing Address: 1333 S. MAYFLOWER AVE., 2ND FLOOR MONROVIA, CA 91016
Mailing Phone: (626) 775-3514
Mailing Fax
Is Sole Proprietor?: No
Enumeration Date: 08-04-2006
Last Update Date: 08-11-2015
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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification: Thoracic Surgery (Cardiothoracic Vascular Surgery)
Taxonomy Code: 208G00000X
Type: Allopathic & Osteopathic Physicians
License No.: G36693
License State: CA
Taxonomy Description: A thoracic surgeon provides the operative, perioperative and critical care of patients with pathologic conditions within the chest. Included is the surgical care of coronary artery disease, cancers of the lung, esophagus and chest wall, abnormalities of the trachea, abnormalities of the great vessels and heart valves, congenital anomalies, tumors of the mediastinum and diseases of the diaphragm. The management of the airway and injuries of the chest is within the scope of the specialty.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No.	Taxonomy Code	Type	Classification / Specialization	License No. (State)
1	2086X0206X	Allopathic & Osteopathic Physicians	Surgery Surgical Oncology	G36693 (CA)

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

Medicare

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Medicaid

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier	Type / Code	Identifier State
A46768	MEDICARE UPIN (02)
WG36693B	MEDICARE ID-TYPE UNSPECIFIED (04)	CA
00G386930	MEDICAID (05)	CA

NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1598773582, we treat the final digit (2) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 78. The final step is to find the difference between that total and the next multiple of ten (80 - 78 = 2).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 18 → 1 + 8

Pos 4

Unchanged

Pos 5

Doubled → 14 → 1 + 4

Pos 6

Unchanged

Pos 7

Doubled → 6

Pos 8

Unchanged

Pos 9

Doubled → 16 → 1 + 6

Check

Target digit

Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 9 → 18 → 9 7 → 14 → 5 3 → 6 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 5 + 1 + 8 + 8 + 1 + 4 + 7 + 6 + 5 + 1 + 6 + 24 = 78

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 78 is 80. The difference is the calculated check digit.

80 - 78 = 2

This NPI is valid

The calculated check digit is 2, which matches the last digit of 1598773582.